在iPhone SDK上等待CLLocationManagerDelegate的didUpdateToLocation方法时，不会填充UITableView [英] UITableView doesn't populate when waiting for CLLocationManagerDelegate 's didUpdateToLocation method on iPhone SDK

问题描述

我正在尝试用一个单元格数组填充UITableview。我通常从viewDidLoad方法执行此操作，但是这次我要根据位置填充数组。下面是我的界面的第一行：

I'm trying to populate a UITableview with an array of cells. I usually do this from the viewDidLoad method but this time I want to populate the array based on location. Below is the first line of my interface:

@interface RootViewController : UITableViewController 
<UITableViewDelegate, UITableViewDataSource, CLLocationManagerDelegate> {

在实现文件中，viewDidLoad方法如下所示：

In the implementation file the viewDidLoad method looks like this:

- (void)viewDidLoad {

    // for location
    self.locationManager = [[CLLocationManager alloc] init];
    [locationManager startUpdatingLocation];
    locationManager.delegate = self;
    locationManager.distanceFilter = kCLDistanceFilterNone; 
    locationManager.desiredAccuracy = kCLLocationAccuracyBest;


    [super viewDidLoad];
}

我在didUpdateToLocation方法中填充了单元格数组：

I populate the array of cells in the didUpdateToLocation method:

    self.title = @"Open Buildings";

NSMutableArray *buildingArray = [[NSMutableArray alloc] initWithObjects:building1, 

self.controllers = array;

在找到位置但未填充数组时，视图标题将更新。当我在viewdidupdate中包含以上代码时，该数组确实已填充。我必须将其移至didupdatelocation方法，因为当视图加载到viewDidLoad方法中时，应用程序将没有位置信息。

The title of the view updates when location is found but the array doesn't populate. The array did populate before when I had the above code in the viewdidupdate. I had to move it to the didupdatelocation method because the application won't have the location info when the view loads in the viewDidLoad method.

推荐答案

您的表格视图不知道您有新数据。因此，一旦有了新数据，就需要告诉表视图重新加载：

Your table view doesn't know you have new data. So, once you have the new data, you need to tell your table view to reload:

[myTableView reloadData];

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